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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Reclassificatons (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Reclassifications
Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net	$ 68	$ 72
Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net	$ (109)	$ (99)

X

- Definition

Reclassification from Environmental cleanup costs-Kingston ash spill-non cash to Other, net on the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

Name:	tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspillnoncashtoOthernet
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reclassification from Environmental cleanup costs-Kingston ash spill to Other, net on the Consolidated Statements of Cash Flows

+ References

No definition available.

+ Details

Name:	tve_ReclassificationfromEnvironmentalcleanupcostsKingstonashspilltoOthernet
Namespace Prefix:	tve_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reclassifications [Line Items]

+ References

No definition available.

+ Details

Name:	tve_ReclassificationsLineItems
Namespace Prefix:	tve_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration